Coffee filter



EPawmiimdi Feb. I2, 1935 PATENT OFFICE OOFFEE FILTER Petronella' Efltbauer, Chicago, Ill. assiznor to Rose Edtbauer am] Julia Edtbauer, both o! Chicago, Illinois Applicatioh- April 23, 1932, sm.1 N0. 607,124

8 Claims.

My present invention relates to an apparatus for making cofiee and is designed to ca.rry out the princ1ple 01 depositing ground coffee in a. coutainer that is mounted upon the top 01 a. coflee pot; or the like and then pouring into the cantainer boiling water which is permitted to filter through the ground coffete into the cofiee-pot. A structure of this character avoids the use of a fabric bag,or the cloth or paper fllter, and also successfully prevents the boiling of th'e finished coffee which usually has a. tendency to spoil the aroma, and taste of the fluid coflee.

In carrying out my invention I employ a. movab1e sieve or filter that is capable 01 being accurately and positively adjusted to take care 01 the required or desired. number of cups 01 cofiee that are to be made, a.nd this adjustable sieve or filter also permits the adaptation of the filtration for diflerent ty;5es of groundor pulverized coffee, as well as provides for acct1rately timing the period of filtration. The structure is adapted for use with finely ground coffee. with the result that, by timing the period 013 filtration the wa.ter passing through the ground coffee does not take up or assimilate any 013 the objectionable or deleterious ingredients cf the coffee bean.

Among the objects cf my invention are the provision of an appara,tus for preparing coffee which is simple in construction and ea.sy to manipulate; is made of a. few dependable parts'that will not readily get out of order; will provide means whereby adjustment of the sieve or filter element may be accurately made by persons unskilled in the a.rt of cotfee making; and. the structure is made up 01 a minimum 01 novel parts that may be economically manufactured and sold a.t a. reasonable retai1 price.

In addition to the foregoing, my apparatus successfully overcomes certain 01 the defects, objections, and disadvantages that are Iound to be inherent in coffee-making devices heretofore produced. Other objects and advantages 01 my improvements will be apparent others skilled in the art after my invention is understood 1rom the Io1lowing description.

I prefer to carry out my invention and to accomplish the numerous objects thereot in substantially the manner hereinafter fully described and as more particularly pointed out in the claims. Reference is now made to the accompanying drawing that forms a part o! this spacification.

In the drawing:

Figure 1 is a view, partly in broken away section, showing my invention applied to an ordinary REISSUED coflee -pot the latter being on1y partially shown.

Figure2 1s a. view of the sieve or filter element a.nd the lower portion 01 the nozzle or funnel viewed a.t a right-angle t0 the structure shown in Figure 1.

The drawing, it will be understood, is more or less schematic for the purpose 01 disclosing a typical er preferred form in which my inventin may be made, and in said drawing 1ike reference characters ar'e employed to designate 1ike parts wherever they appear in the difierent views.

In Figure 1, the well-known type 015 coffee-pot, designated a.t A has a. suitable handle B and a pouring spout C, all of which are of usual canstruction. The hinged top, so far as this disclosure is concerned, has been omitted, but in actual practice the top 01' lid may be turned back upon its hinge for conveni ently using my appliance.

The structure which I have devised consists 01 a hollow receptacle 5 that is cylindrical in shape and, acljacent its upper edge or rim, is provided with an inwa.rdly extending baad 6 while its top e dge is turned-back or rolled as a.t 7 and it is closed by a suitable cover or lid8 that rests upon the rolled-back portion 7.

The bead 6 provides a, stop or sholcler upon which the outwardly extending annular flange 9 of a. water-spreader rests and is supported within the receptacle 5. The water-spreader has a cylinder body 10 that is preferably imperforate while its bcttom 11 is provided with a plurality 01 apertures 12 through which the water deposited. in the spreader will be distributed into the portion of the receptacle 5 below the spreader. An air-vent, in the form 015 a short tube 13, extends upwardly from the central portion 0f the bottom 11 in the manner shown, and the depth o1 this spreader is such that its bottom will be spaced from the particles 01 ground coffee that are deposited in the receptacle.

The lower portlon of the container 5 has its annular wal1 turned inwardly to provide a wide shoulder 14, which, when the appliance is in use, will r est upon and be supported by the upper rim cf the coffee-pot A. This intumed p0rtion or shoulder 14 also assists in providing a restricted nozzle or funnel at the lower end of the receptacle 5. The nozzle or funnel just referred 120 consists of a downwardly extending wall 15 that is cylindrical in shape a.nd preferably concentric with the main wall 01 the receptacle 5 and, at its lower portion, it has an inturned flange 16, thus provlding a restrlcted open'ing 17 in the lower end o1. the nozzle or funnel.

The filter is an inverted cup-shapecl element consisting o! a cylindrlcal wall 18 that has 9. dome-shaped top closure 19 which is lmperi'orate. The cylindrical side wall of thls element ls provided witha plurallty o1 small perforations 20 that are preferably arranged in parallel rows ektendlng transversely around the cylinder 18 and spaced apart vertlcally, the upper rw 013 perforations being slightly below the edge of the dome 19 and the bottom row of periorations being slightly above the lower edge of the cylinder 18. The outside diameter of this element, (that is the exterior surface of the wall of the cylinder 18), is such that a frictional sliding fit ls had between said element and the edge of opening 17 at the bottom of the nozzle or funnel 01 the receptacle. This permits the fl1ter element to be moved up or down so that it may be positioned at any location desired am]. thus expose or open any'number of perforations 20 above the flange 16 of the nozzle orfunnel, to carry out the filtration of the water through the ground coffee and intothe cofifee-pot A. y

Ordinarily the structure above described could be manipulated in a dependable manner by a person who would use skill and care in making the adjustment. but in order to provide accurate and positive means for determining the proper amount of adjustment relative to the number o! cups of cofiee to be made I have provided' a definite gauge so that unskilled persons will not incorrectly manipulate the filter element. 'I'o this end I have provided a pair of arms 21 each of which is secured or anchored at one end 120 the flange 16, and at their other ends the arms counected to a. cross-piece 22 so that a substantially U-shaped yoke is provlded. 'Ihe space between the arms is greater than the outslde diameter of the fllter elements, or the diameter of the opening 17 in which the fllter element is adjustably mount'ed. In Figure 1 013 the drawing I have shown the arms 21 depending from the flange but it is obvlous they may extend upwarclly into the receptacle, or arranged in any other suitable manner.

The arms are provlded with serrations 23 that are properlj; spacedapart to designate the various points 01 adjustment to which the fllter element may be set in order to accurately time the filtration in direct relation to the number cf cups 01 coffee to be made er to the grind of the coftee being Used. As will be seen in the drawing, these serrations are made upon opposite edges of the arms 21, the purpose of which will be hereinafter explained. Cooperatingwlth the slots 24 that are between the serrations 23 are lateral lugs or ears 25 that project radially from the lower edge of the cylindrical wall 18 of the fllter element, so that, by a slight rotative movement of the fllter element. the lugs or ears 25 may be selectively engaged with the difierent slots 24 in the arms and the fllter element maintained against accldental up or down movement.

In any o1 its adjusted posltions in the openlng 17 the fllter elemeimt will be projected above the lower lateral flange 16and will be separated Irom the nozzle wall 15 to provide an annular groove or trough a: between said parts. 'I'he ground coffee, when a small quantity is* used, is deposited in this trough as lt will gravitate oft the domeshaped top of the filter element, anti when langer quantities 015 ground cofiee is used a portion ot the latter will lie upon the shoulder or flange 14 of the receptacle.

When using the appllance to prepare, Ior exof the filter element are inserted in the tourth slot 24 up 1'rom the bottom of the arms, and the proper amount 01' the ground coifee is placed in the receptacle so that the ground oofieewill be deposited in the annular trough x. When the lugs or ears 25 are in their proper slots 24 the desired number of rows 01 perforations20 will be exposed and above the horizontal plane o! the unturned lower flange 16 01 the nozzle. The spreader is then placed in the receptacle and four cups of boiling water are poured into the top 01 the receptacle, immedlately alter which the cover 8 is placed on the receptacle.

The spreader distributes the boiling water over the ground coffee and the water seeps or filters through the latter anti through the perforations 20 to the interior of the filter eleme'nt from which it falls into the coffee-pot or other receptacle upon which the appliance is mounted. This operation permits the water to take out or extract the taste and flavor 01 the grouncl cofiee and alter all of the water has filtered through into the pot A or other receptacle the product is ready for consumption.

The same method is employed for making any number o! cups 01 coflee, simply by inserting the lugs or ears 25 into the slots designating the required number 01 cups o1 coffee to be made. On account of the perforations in the filter elementbeing in the vertical wall of the filter the weight of the water pressing downwardly upon the ground' coffee does not interfere materially with thefiltration operation 8Ild the seepage of the water is continuous and wlth a steady flow resulting in a clear fluld without sediment.

It will be understood that modificatlons or refinements o! the exact structure herein disclosed may be made without materially departing Irom the principles of my invention. Hence, the accompanying drawing and the within description are given Ior the purpose 013 clearness o1 understanding only and no unnecessary limitations are to be understood therefrom, but the 'claims are to be construed as broadly as permissible in view 01 the prior art.

What I claim is:

1. An appliance 01 the klnd descrlbed, compris- -ment and said arms tor predetermining and releasably maintalnlng said fllter elemen't in divers adjusted positions.

2. An appliance of the kind described, comprlsing a suitable receptacle, a restricted throat depending therei'rom and havlng an opening in its lower end, transversely slotted arms pendent from said throat, an inverted cup-shaped fllter element adjustable in said opening the side- Wall of said element being perforatedand lateral members an said element cooperable with the slots in the arms for maintalnlng the element at divers helghts wlthin the throat and uncover a predetermined number 01' pertorations withln the throat.

3. An ap;' liance of the kind descrlbed comprislng a suitable receptacle havlng an opening in its bottom, an inverted cup-shaped fllter element having a pertorated cylindrlcal Wall disposed in said opening and extended into said recepta'.cle to provide an annular trough around said fl1ter element, vertical arms projecting from said receptacle alongside said fllter element, and cooperating means an said arms and said. element for maintaining the latter at divers helghts within said receptaqle.

4. An appliance o! the kind described comprising a suitable receptacle having an opening in its bottom, an inverted cup-shaped fllter elemen'o having a pertorated cyllndrical wall disposed in said. opening and extended into said receptacle to provide an annular trough around said fi1ter element, igransversely recessed arms projecting from said receptacle alongside said fl1ter element, anti lateral members on said filter element that are cooperable with said recesses 1'0r adjustably positioning said fl1ter element with' respect to said receptacle.

5. 'Ihe combination with a sultable container,

'0f an appliance 015 the klnd described comprising a receptacle' ha ving a shouldered lower portion resting upon the rim of said container to support the receptacle, a cyllndrical wall extending down from said shoulder into said container, an inwa'rdly extending flange on said cylindrical wall providing an opening 01 lass diameter than said wall, a filter having a cylindrlcal perforated wall positioned in sald opening whereby an annular trough ls provided around said fllter. stationary parallel arms alongside said fllter, and means cooperating with said arms and fllterfor meintaining the latter in divers adjusted positions. 1

' 6. 'Ihe combination with a suitable container, o1 an appliance o1! tl1e kind. described comprising a receptacle having a shoulder-ed Iowerportion restlng upon the rlm 01 said contalner to support the receptacle, a cylindrical Wall extending down Irom said shoulder into sald container; an inwardly extending flange on said. cylindrical wall providing an openlng of less diameter than said wall, a fllter having a cyllndrical perforated wal1 positioned in said o pening whereby an annular trough is provided around said ber, transversely slotted stationary arms alongside said fllter, and lateral lugs on said fllter that enter opposite slots in said arms Ior maintaining the filter in adjusted positions determined by the respective slots.

7. An appliance ior making coffee comprising a redeptacle having an opening in its bottom, a fllter element adjustably mbunted in sald openfing, arms projecting trom said receptacle alongside said filter element, and. means an the fllter elemeni: coacting with said arms to provida predetermined adjustment o! said element.

8. An appliance Ior making coflfee comprising a receptacle having an -opening in its bottom. a filter element adjustably mounted in said unening, transversely slotbed arms projecting from said receptacle alongside said fllter element, and

lateral lugs an said filter element coacting with the slots in said arms to posltibn the fllter element at diflerent heights within the receptacle.

PETRONELLA EDTBA'UER. 

